Mixing-machine.



Patented May 18, 1909.

2 SHEETS-SHEET 1 R. EDMONDSON.

MIXING MAUHINE.

APPLIUATION FILED Amm, 190s.

W u A15S .fr x

R. EDMNDSON.

MIXING MACHINE.

APPLICATION FILED AUG. a, 1908.

Patented May 18, 1909.

2 SHEETS-SHEET 2.

vROliIR/f EDMONDSON, OF'MOUN'I VERNON, OH IU.

MIXING-MA CHINE Specification of Letters Patent.

Patented May 18, 1909.

appiieanon nieu August s, anos. semi No. 44mm.

To all whom it 'may concern:

Bo it known that I, ltoimirr EDMoNDsr'iN, a citizen of the United States, residing at Mount Vernon, in the county of Knox vand State of Ohio, have invented certain new and useful Improvements in Mixin r-Macliines, of which the following is a speci ication.

This invention relates to concrete mixing machines.

One object of the invention is to provide a concrete mixer embodying such characteristics that it may be easily and freely rotated to mix concrete material and subse uently tilt it to discharge the mixed inateriafl therefrom in such a way that the drum will not be operated or disengaged from the elements by which it is rotated.

' Another ob'ect of the invention is to mount the mixing rum upon a swinging support, so, that the drum and support may be swung together when it is desired to relieve the drum of its contents.

A still further object of the invention resides in the provision of a mixing drum for concrete mixers whose interiml is so formed that the concrete material ingredients will be caused to rise and fall during rotation of the drum to insure efficient mixing of the material and also to provide for a free and easy discharge of the material from the drum in such a manner as to obviate the'possibility of the material sticking to the sides or the juncture between the sides and bottoni of the rum.

lith the above and other objects in View, the present invention consists in the combination and arraneement of parts hereinafter more fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claim, it being understood that changes ma be made in the form, proportion, size an minor details without departing from the spirit or sacrificing any of the advantages of the invention.

n the drawingsz igure 1 is a vertical sectional view of the invention. Fi 2 is a top plan view. Fig. 3 is an end e evation showin different positions of the drum in dotted ines. Fig. 4 is a top plan view of the swinging crosslbar adapted to support the drum.

Referring now more particularly to the accompanying drawings, the reference characters 1 and 2 Aindicate suitable standards, each provided with a bearing 3 at its upper end adapted to receive the corresponding truni liions 4 of each piece 5 which latter are secured by means of suitable bolts 6 in tho ears 7 at the corresponding ends of the swingingr cross bar 8. I`hese pieces 5 aro operable with the swinging cross bar 8 and by reason of their use it follows that the swinging cross bar is made in separable sections.

'lhe swinging cross bar S is rovided with a recess 9 in its under face wit i which coinmunicates an opening 10 formed through the top of the cross bar to receive the journal stud 1'1 ixcdly secured to the bottoni of the drum 12 in any suitable manner, the journal stud 11 extendingI into the recess 9 and through a bearing fitted in the latter coinprising upper and lower plates 13 and 14 between which latter is arranged a ring 15, tho upper and lower plates 13 and 14 and the ring 15 having grooves to provide race-ways for the upper and lower set-s of bearing balls 16 and 17, res actively, whereby the drum has an easy an free rotation upon the swinging cross bar regardless of whether the drum be in its normal position or swung downwardly in a manner hereinafter described.

'lo rovide for rotation of the druin l2 l provi e the same with an annular toothed rack 18 along its under edfre with which meshes a pinion 19 carried at the inner end of a short shaft 20 extended through one of the end extensions 5, as shown in Fig. 1. At the other end of this shaft 20 I provide pulleys 2l for connection with a suitable belt or other driving means (not shown) to rotate the shaft 2() and consequently the drum through. the rack and gear connections 18 and 19, respectively. 'lhus the drum may be readily rotated upon its axis 11 and it is obvious that different speeds of rotation may be accomplished according to requirements.

Frictional resistance incident to the rotation of the drum is reduced by providing the swinging cross bar S with a pair of ears Z2 near each end thereof for the rotatable reception of the friction wheels 23, which latter bear against the bottom ofthe drum 12 Within the circular rack 18, as clearly shown in Fig. 1.

he mixing drum 12 is referably concave to provide spaced channe s 24 separated by the ridges 25, which latter are preferably equidistant. These channels prevent the material from clin ing to the sides of the drum during rotation of the latter. When the drum is rotated the material is caused to rise a certain height in these channels ac- I oording to the speed of rotation of the drum.

The result is t at the material constantly rises and falls in the channels of the drum msuring a thorough mixing of the material and also insurin a ainst the material sticking to the sides o t e drum. The mixing drum usually revolves at an angle of from 40 to 60 degrees, and if the sides were smooth, the material if wet, would not turn over, but on the other hand would settle in the bottom of the drum. In the present instance, the ridges arrest the material and cause it to move upwardly in the channels a certain height according to the speed attained by the drum, and roll back to the starting point, that is to the bottom of the drum.

. ridges will not hold the material after the latter has been carried to a certain height, but cause the material to roll back and thereby in its frequent turning over insure a thorough mixing of the ingredients of which the concrete material is usually composed. course, when the material is carried to its Vrreatest height on the sides of the mixing rums, it has farther to roll back, and consi uently the farther the material 1s caused te e evate in the drum and roll back the more thoroughly and quickly will 4be the mixing process.

After the material liasbeen'thorouglily mixed, he swinging cross bar 8 is swung upon the trunnions 4 of the extensions 5 in an suitable manner, one form of means resi ing in providing the trunnion 4 of the extension 5 o posite the triifnion in which the shaft 20 is `tted, with a gear 26 designed to mesh with a gear 27 on the shaft 2S journaled and also inthe outer the handle bars 34 to rotate the shaft 28 it will result in the gear 27, which is in lnesh with thegear 26 on the trunnion of one of the extensions of the swinging cross bars 8, to cause a swinging movement of the latter which will consequently throw the drum 12 downwardly upon either sideof the axis of The the drum, as shown in dotted lines in Fig. 3 without disengaging the drum from the parts with which it is associated in its position for mixing purposes. y

When the drum is tilted, to discharge the material therefrom, it follows that the Inaterial will not clin to the inner sides of the drum by virtue o the concave channels 24 which insure the material sliding from the drum quicker and easier than would be the Tease if the drum were perfectly smooth and `not provided with the spaced concave channels, and in .order that the material will not cling to the juncture between the sides and bottom .of the drum, I provide suchjuncture with an inclined strip 35 whose outer edges conform to the shape of the inner `surface o1' the walls of the drinn, as clearly shown in the drawings. L

Frein the foregoing, it will be seen that-I provide a comparatlvely simple, inexpensive, durable and efiicient mixerfor the purpose herein outlined, and that since the. swinging cross bar is composed of sections, it fo ows that certain of the sections may be stronger than others or formed of different material for other reasons.

What is claimed is A concrete mixer comprising standards, a

cross bar journaled in the standards, a mixing drum rotativel its upper end and iaving the inner surface o side walls lrovided with parallel channels extending -rom'the bottom of the drum to the top of the latter and se aratedby vertical parallel ridges, an ino ined strip disposed at the juncture of the bottom and sides of the drum and having its outer edge conforming to the shape of the interior of the` side walls to revent the material from adhering in sai` juncture when the drum is tilted, means for rotating the drum, and means for tilting the drum.

In'testiinony whereof affix my signature, in presence of'two witnesses. A

ROBERT EDMONDSON.

AWitnesses;

Rom L. Cana, IDA BENNETT.

y mounted upon the cross bail and havingl a c osed bottom and an open 

